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    If set, and Jenkins is set to poll for changes, Jenkins will ignore any revisions committed with message matched to
    <a href="http://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html">Pattern</a> when determining
    if a build needs to be triggered. This can be used to exclude commits done by the build itself from triggering another build,
    assuming the build server commits the change with a distinct message.
    <p/>Exclusion uses <a href="http://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html">Pattern</a>
    <a href="https://docs.oracle.com/javase/8/docs/api/java/util/regex/Matcher.html#matches()">matching</a>
    <p/>
  <pre>.*\[maven-release-plugin\].*</pre>
    The example above illustrates that if only revisions with "[maven-release-plugin]" message in first comment line
    have been committed to the SCM a build will not occur.
    <p/>
    You can create more complex patterns using embedded flag expressions.
   <pre>(?s).*FOO.*</pre>
     This example will search FOO message in all comment lines.
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